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Eslamlou, A.D. (author), Ghaderiaram, A. (author), Fotouhi, M. (author), Schlangen, E. (author)The growing demand towards life cycle sustainability has created a tremendous interest in non-destructive evaluation (NDE) to minimize manufacturing defects and waste, and to improve maintenance and extend service life. Applications of Magnetic Sensors (MSs) in NDE of civil engineering structures have become of great interest in recent years...conference paper 2023
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Marega, Giovanni (author)The most problematic eigenmode in machines involving flexure mechanisms is represented by flexural modes. However, it can be noticed that also out-of-plane modes, that occur in the space outside the nominal plane of movement of the mechanism, can be very important, especially in machines with several and coupled degrees of freedom, like 3D...master thesis 2022
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Kollaard, Freek (author)As the environment is changing temperatures are changing, becoming more extreme. This is expected to affect the oceans and its transport, specifically the Atlantic Meridional Overturning Circulation (AMOC). The Labrador Sea is a part of the AMOC, where overturning in depth and density space occurs, due to deep convection. Deep convection is the...master thesis 2022
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Chen, X. (author), Ammu, S.K. (author), Masania, K. (author), Steeneken, P.G. (author), Alijani, F. (author)Levitation offers extreme isolation of mechanical systems from their environment, while enabling unconstrained high-precision translation and rotation of objects. Diamagnetic levitation is one of the most attractive levitation schemes because it allows stable levitation at room temperature without the need for a continuous power supply....journal article 2022
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Cao, Zhi (author), Huang, Yunkai (author), Peng, Fei (author), Dong, J. (author)Position sensing is one of the crucial parts of the active magnetic bearing (AMB) system. The printed circuit board (PCB) eddy current position sensor is a new type of position sensor for the AMB system, which makes a compact structure, high sensing quality, and is low cost. In this article, an improved driver circuit is proposed for this new...journal article 2022
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Luo, T. (author), Ghaffarian Niasar, M. (author), Vaessen, P.T.M. (author)Winding loss calculation is essential for inductor and transformer design. In this article, a revised 1-D Ferreira's formula is proposed, which considers the interaction between conductors. Then, a 2-D loss calculation approach is proposed based on the analytical solution of round conductors under a uniform external field. An equivalent...journal article 2022
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Mascini, Merlijn (author)Eddy currents are currents which are induced in a conducting object by a varying magnetic field. These currents generate a magnetic field of their own. Modelling this phenomenon constitutes a diverse and challenging set of problems, for which many applications exist. One such application is the degaussing system of a naval ship. To guarantee...master thesis 2021
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Wani, F.M. (author)Among different ways of harnessing tidal energy, tidal stream turbines are gaining popularity over traditional tidal dams. This is owing to the lower capital cost, and potentially lower ecological impact of tidal turbines. However, compared to more developed sources of energy, tidal energy remains expensive, which impedes its large-scale...doctoral thesis 2021
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Pimenta, Matheus (author), Gürleyük, C. (author), Walsh, Paul (author), O’Keeffe, Daniel (author), Babaie, M. (author), Makinwa, K.A.A. (author)This article presents a low-power eddy-current sensor interface for touch applications. It is based on a bang-bang digital phase-locked loop (DPLL) that converts the displacement of a metal target into digital information. The PLL consists of a digitally controlled oscillator (DCO) built around a sensing coil and a capacitive DAC, a...journal article 2021
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Zhao, Weichuan (author)With the aid of the analytical formulas of the disc pair model inter-shielded by different type of shield wires, the total series capacitance of the disc pair could be calculated. After introducing a number of inter-shield pairs to the disc pair model, the influence on the mutual inductance between discs has been thoroughly discussed. Last but...master thesis 2020
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Liu, D. (author), Song, X. (author), Deng, Fujin (author), Dong, J. (author)High-Temperature superconducting (HTS) generators are being considered as a competitive candidate in large direct-drive (DD) wind turbines because of their features of being lightweight and compact. Normally a large air gap is inevitable in partially HTS generators, sacrificing the torque producing capability. In this paper, multi-phase...journal article 2020
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Zhu, Zichong (author), Huang, Yunkai (author), Dong, J. (author), Peng, Fei (author), Yao, Yu (author)This article presents a new rotor design to reduce rotor eddy current loss of a high-speed permanent magnet synchronous machine for flywheel energy storage system. Instead of using common nonmagnetic sleeves, the new rotor incorporates permeable retaining sleeves (PRSs) to fix permanent magnets on the rotor hub. The PRSs are made of permalloy...journal article 2020
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Liu, Dong (author), Song, Xiaowei (author), Dong, J. (author)High temperature superconducting (HTS) generators are being considered for large offshore direct-drive (DD) wind turbines as they are expected to be lightweight and compact. However, short circuit torques of an HTS generator with integral-slot distributed windings (ISDWs) are too high for wind turbine constructions, mainly due to the large...journal article 2020
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Chen, X. (author), Keşkekler, A. (author), Alijani, F. (author), Steeneken, P.G. (author)Diamagnetic levitation is a promising technique for realizing resonant sensors and energy harvesters since it offers thermal and mechanical isolation from the environment at zero power. To advance the application of diamagnetically levitating resonators, it is important to characterize their dynamics in the presence of both magnetic and...journal article 2020
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Ferreira Pimenta, Matheus (author)This thesis presents an Eddy current sensor (ECS) for button readout applications. By employing a Phase-locked loop to perform a frequency readout, it was possible to significantly reduce the power consumption of the interface while achieving resolutions comparable to prior arts making it a more suitable solution for portable applications. The...master thesis 2019
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Zhu, Zichong (author), Huang, Yunkai (author), Dong, J. (author), Peng, Fei (author)This paper presents a new rotor design with assembled permeable retaining sleeve (APRS) to improve performances of a high speed permanent magnet synchronous machine (PMSM). The APRS consists of equal number of permeable and nonmagnetic parts, which are alternately arranged and assembled together circumferentially via keyways. Electromagnetic and...journal article 2019
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Wani, F.M. (author), Shipurkar, U. (author), Dong, J. (author), Polinder, H. (author)Improving availability of tidal turbines has been identified as a key area to lower the levelized cost of energy from tides. One of the approaches suggested to achieve high reliability is to use a flooded permanent magnet (PM) generator. Flooded PM generators are designed to operate with a seawater filled stator-rotor gap in the generator. Using...conference paper 2019
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Wani, F.M. (author), Dong, J. (author), Yadav, Avinash (author), Polinder, H. (author)Flooded Generators have been proposed as a possible solution to eliminate the risks due to the seal failure, and improve cooling in tidal stream turbine generators. In a flooded generator, the stator-rotor gap is filled with the seawater; this poses a serious corrosion risk to the material inside the generator. For this reason, a can or a...conference paper 2018
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Wani, F.M. (author), Dong, J. (author), Polinder, H. (author)Permanent magnet machines with fractional slot windings are popular because of their shorter end windings, low cost and ease of manufacturing. On the other hand, fractional slot machines have higher eddy current losses in the rotor magnets and sleeve. An accurate calculation of these losses usually involves a time-stepped finite-element analysis...conference paper 2018
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Chaturvedi, V. (author), Vogel, J.G. (author), Makinwa, K.A.A. (author), Nihtianova, S. (author)This paper presents an eddy-current sensor (ECS) interface intended for sub-nanometer (sub-nm) displacement sensing in hi-tech applications. The interface employs a 126-MHz excitation frequency to mitigate the skin effect, and achieve high resolution and stability. An efficient on-chip sensor offset compensation scheme is introduced which...journal article 2018